HMM Summary Page: TIGR03011

Functionsulfur relay protein TusB/DsrH
Gene SymboldsrH
Trusted Cutoff49.20
Domain Trusted Cutoff49.20
Noise Cutoff29.40
Domain Noise Cutoff29.40
Isology Typeequivalog_domain
EC Number2.8.-.-
HMM Length95
Mainrole CategoryProtein synthesis
Subrole CategorytRNA and rRNA base modification
Gene Ontology TermGO:0002098: tRNA wobble uridine modification biological_process
GO:0016782: transferase activity, transferring sulfur-containing groups molecular_function
AuthorHaft DH
Entry DateJul 21 2006 4:12PM
Last ModifiedFeb 14 2011 3:27PM
CommentThe three proteins TusB, TusC, and TusD form a heterohexamer responsible for a sulfur relay reaction. In large numbers of proteobacterial species, this complex acts on a Cys-derived persulfide moiety, delivered by the cysteine desulfurase IscS to TusA, then to TusBCD. The activated sulfur group is then transferred to TusE (DsrC), then by MnmA (TrmU) for modification of an anticodon nucleotide in tRNAs for Glu, Lys, and Gln. The sulfur relay complex TusBCD is also found, under the designation DsrEFH, in phototrophic and chemotrophic sulfur bacteria, such as Chromatium vinosum. In these organisms, it seems the primary purpose is related to sulfur flux, such as oxidation from sulfide to molecular sulfur to sulfate.
ReferencesRN [1] RM PMID: 16387657 RT Mechanistic insights into sulfur relay by multiple sulfur mediators involved in thiouridine biosynthesis at tRNA wobble positions. RA Ikeuchi Y, Shigi N, Kato J, Nishimura A, Suzuki T RL Mol Cell. 2006 Jan 6;21(1):97-108. RN [2] RM PMID: 9695921 RT Sirohaem sulfite reductase and other proteins encoded by genes at the dsr locus of Chromatium vinosum are involved in the oxidation of intracellular sulfur. RA Pott AS, Dahl C RL Microbiology. 1998 Jul;144 ( Pt 7):1881-94. DR HAMAP; MF_01564; 37 of 38
Genome PropertyGenProp0654: intracellular sulfur oxidation (HMM)